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Google Analytics PHP Tracking Code

This PHP script creates a 1×1 invisible image (__utm.gif) for tracking print usage using Google Analytics.

The Google Analytics Profile ID and the Landing Page URL are passed to the script via GET Parameters while the Referrer and User Agent string are determined from the request headers.

 array(
          "method" => "GET",
          "user_agent" => $_SERVER["HTTP_USER_AGENT"],
          "header" => ("Accept-Language: " . 
                          $_SERVER["HTTP_ACCEPT_LANGUAGE"]))
    );
    if (!empty($_GET["utmdebug"])) {
      $data = file_get_contents(
          $utmUrl, false, stream_context_create($options));
    } else {
      $data = @file_get_contents(
          $utmUrl, false, stream_context_create($options));
    }
  }

  // Track a page view, updates all the cookies and campaign tracker,
  // makes a server side request to Google Analytics and writes the 
  // transparent gif byte data to the response.
  function trackPageView() {
    $timeStamp = time();
    $domainName = $_GET["d"];
    if (empty($domainName)) {
      $domainName = "";
    }

    // Get the referrer from the utmr parameter
    $documentReferer = $_GET["utmr"];
    if (empty($documentReferer) && $documentReferer !== "0") {
      $documentReferer = "-";
    } else {
      $documentReferer = urldecode($documentReferer);
    }

    $documentPath = '/print' . urldecode($_GET["u"]);

    $account = $_GET["id"];
    $userAgent = $_SERVER["HTTP_USER_AGENT"];
    if (empty($userAgent)) {
      $userAgent = "";
    }

    // Try and get visitor cookie from the request.
    $cookie = $_COOKIE[COOKIE_NAME];

    $guidHeader = $_SERVER["HTTP_X_DCMGUID"];
    if (empty($guidHeader)) {
      $guidHeader = $_SERVER["HTTP_X_UP_SUBNO"];
    }
    if (empty($guidHeader)) {
      $guidHeader = $_SERVER["HTTP_X_JPHONE_UID"];
    }
    if (empty($guidHeader)) {
      $guidHeader = $_SERVER["HTTP_X_EM_UID"];
    }

    $visitorId = getVisitorId($guidHeader, $account, $userAgent, $cookie);

    // Always try and add the cookie to the response.
    setrawcookie(
        COOKIE_NAME,
        $visitorId,
        $timeStamp + COOKIE_USER_PERSISTENCE,
        COOKIE_PATH);

    $utmGifLocation = "http://www.google-analytics.com/__utm.gif";

    // Construct the gif hit url.
    $utmUrl = $utmGifLocation . "?" .
        "utmwv=" . VERSION .
        "&utmn=" . getRandomNumber() .
        "&utmhn=" . urlencode($domainName) .
        "&utmr=" . urlencode($documentReferer) .
        "&utmp=" . urlencode($documentPath) .
        "&utmac=" . $account .
        "&utmcc=__utma%3D999.999.999.999.999.1%3B" .
        "&utmvid=" . $visitorId .
        "&utmip=" . getIP($_SERVER["REMOTE_ADDR"]);

    sendRequestToGoogleAnalytics($utmUrl);

    writeGifData();
  }
?>